Build Out Code Complexity Metrics

[KetanReddy]

Basic example started in this branch with a couple to-dos:

• Get nested bindings/expressions working. Right now since we stop processing them after they are first detected they never fall through to finish the rest of the processing. I mocked out the basic interface for the model/expression evaluator so that might need to get fleshed out a bit more to do more parsing without having to do processing.
• Identify and weight nodes with Template functionality. Templates are a runtime hit for Player to expand the template so we should increase the weight of any nodes within a template (and increase that weight for compound templates) but for that we'll need to be able to determine if any node is the child of a template node which is something we currently can't do as part of the LSP. This is something we'll need to do though in general as we expand validation functionality (related [@player-tools/json-language-service] DuplicateIdPlugin: Template Support #91 )
• Determine more accurate weighting of node types
• Support config for weighting different Assets. Different integrations should be able to specify a weight that each asset/view has on the render and have that be reflected in the complexity score

Outcome

Finished Plugin with previously mentioned tasks closed